#include <sys/mman.h>
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>

typedef struct {
    char name[4];
    int age;
} people;

int main(int argc, char **argv) {
    int fd, i;
    people *p_map;
    fd = open(argv[1], O_CREAT|O_RDWR, 00777);
    p_map = (people *)mmap(NULL, sizeof(people)*10, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);

    for (i = 0; i < 10; i++) {
        printf("name: %s, age: %d;\n", (*(p_map+i)).name, (*(p_map)).age);
    }
    munmap(p_map, sizeof(people)*10);
}

